4

Questions
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5
12
votes
4
answers
845
views

Decidability of tiling R^2

may 13 12 at 13:24 Edmund Harriss 885●6●18

2
11
votes
2
answers
2k
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Which platonic solids can form a topological torus?

jan 31 11 at 21:05 Dave Rusin 91●2

 
6
votes
1
answer
521
views

Length of shortest possible knot

feb 10 11 at 17:25 Oliver 1,104●6●19

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1
vote
3
answers
1k
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Seemingly complex logic/set-theoretic puzzle

jan 17 11 at 23:15 David Harris 2,599●1●4●18